Which one of the following pairs of animals is warm-blooded?

Which one of the following pairs of animals is warm-blooded?

Crocodile and Ostrich
Hagfish and Dogfish
Tortoise and Ostrich
Peacock and Camel
This question was previously asked in
UPSC CDS-1 – 2019
Warm-blooded (endothermic) animals are those that maintain a stable internal body temperature regardless of the external environment. Birds (like Peacock and Ostrich) and mammals (like Camel) are warm-blooded. In option D, both Peacock (a bird) and Camel (a mammal) are warm-blooded animals.
Birds and Mammals are warm-blooded (endothermic).
Crocodiles and Tortoises are reptiles, which are cold-blooded (ectothermic). Hagfish and Dogfish are fish, which are also cold-blooded.